/Engine/Source/Runtime/GeometryCore/Public/MeshQueries.h
bounding box of subset of vertices of Mesh
template<typename EnumerableTriListType> static [FAxisAlignedBox3d](API\Runtime\GeometryCore\FAxisAlignedBox3d) GetVerticesBounds ( const TriangleMeshType & Mesh, const EnumerableTriListType & Vertices, const FTransform & Transform )